The popularity of bollards has dramatically increased during the past decade as a result of heightened concerns about security. They are a simple, practical, and cost-effective means of erecting anti-ram perimeter defense without making a visual sense of a fortified bunker. Bollards are popular for traffic direction and control, and in purely decorative applications. However, bollards can serve many functions beyond security. They can be used as purely aesthetic purposes, functioning as landscaping elements. Bollards can create visible boundaries of the property, or separate areas within sites. They can control traffic and are often arranged to allow pedestrian access while keeping entry of vehicles.
Removable and retractable bollards can allow different amounts of access restriction for a variety of circumstances. They frequently tell us where we could and cannot drive, park, bike, or walk, protect us from crime, shield vehicles and property from accidents, and add aesthetic features to the building exteriors and surrounding areas. Bollards can incorporate other functions such as lighting, surveillance cameras, bicycle parking as well as seating. Decorative bollards are created in a variety of patterns to harmonize with an array of architectural styles. The prevalence of the very most common form of buy steel bollards, the concrete-filled steel pipe, has encouraged the manufacturing of decorative bollards created to fit as covers over standard steel pipe sizes, adding pleasing form for the required function.
What Is A Bollard?
A bollard is a short vertical post. Early bollards were for mooring large ships at dock, and they are generally still in use today. A typical marine bollard is manufactured in cast iron or steel and shaped somewhat just like a mushroom; the enlarged top is made to prevent mooring ropes from slipping off.
Today, the term bollard also describes a variety of structures applied to streets, around buildings, as well as in landscaping. Based on legend, the initial street bollards were actually cannons – sometimes said to be captured enemy weapons – planted in the ground as boundary posts and town markers. Once the availability of former cannons was utilized up, similarly shaped iron castings were designed to match the same functions. Bollards have since become many varieties which are widely employed on roads, particularly in urban areas, in addition to outside supermarkets, restaurants, hotels, shops, government buildings and stadiums.
The most typical form of bollard is fixed. The simplest is surely an unaesthetic steel post, about 914 to 1219 mm (36 to 48 in.) above-grade. Specially manufactured bollards include not just simple posts, but in addition numerous decorative designs. Some feature square or rectangular cross-sections, but a majority of are cylindrical, sometimes with a domed, angled, or flat cap. They come in a selection of metallic, painted, and sturdy powder coat finishes.
Removable bollards are employed where the need to limit access or direct traffic changes occasionally. Both retractable and fold-down styles are employed where selective entry is frequently needed, and they are designed and so the bollard can easily be collapsed to ground level and quickly re-erected. Both retractable units might be manually operated or automated with hydraulic movements. Movable bollards are large, heavy objects – frequently stone or concrete – that depend on how much they weigh as opposed to structural anchoring to stay in place. They are designed to be moved rarely, and after that simply with heavy machinery such as a fork-lift.
Bollards generally fall into three types of applications:
Decorative Bollards – decorative bollards for architectural or landscaping highlights;
Traffic and Safety Bollards – bollards which provide asset and pedestrian safety, along with traffic direction; and
Security Bollards and Post Covers – decorative, impact-resistant bollard enhancements
Some bollards are intended purely to be an ornament. As standalone architectural or landscaping features, they are able to border, divide, or define a place. They can be accents, sentries, or supporting players to larger, more dramatic architectural gesture.
Decorative bollards are produced to harmonize with both traditional and contemporary architectural styles. The second lean toward visual simplicity – often straight-sided posts with a number of reveals nearby the top. Styles created to match various historic periods usually have more elaborate shapes and surface details. Included in this are flutes, bands, scrolls along with other ornamentation.The post-top is really a distinctive feature; traditional bollard design often includes elaborate decorative finials, whereas contemporary versions frequently come with a simple rounded or slanted top to discourage passersby from leaving trash or utilizing them for impromptu seating. On the other hand, they are sometimes made flat and broad specifically to encourage seating. Common decorative bollard materials include iron, aluminum, stainless steel, and concrete.
Ornamental designs with elaborate detail are frequently manufactured from iron or aluminum casting. Aluminum bollards are desirable for applications where weight is a problem, like a removable bollard. Aluminum units tend to be slightly more expensive than iron. For applications in which a decorative bollard might be susceptible to destructive impact, ductile iron is actually a safer choice than more brittle metals, as force will deform the metal rather than shatter and transforming it into possible hazardous flying projectiles.
Iron and aluminum bollards are often manufactured by sand-casting – a regular foundry technique that is certainly economical and well-suited to objects this size. However, sand-cast objects frequently bear surface irregularities that often leave the finished product less appealing to the attention. If high-finish consistency is desired, seek a manufacturer that will machine 100% in the surface after casting to create units with a uniform surface for optimum appearance.
Finish is a crucial consideration in a decorative bollard, from functional as well as aesthetic standpoints. Bollards are, by their nature, susceptible to being scratched or nicked by pedestrians and vehicles. Those located near roadways are exposed to a relatively aggressive environment; petrochemical residues and splashes of diluted road de-icing salts may compromise zuhjvq painted finishes. Factory-applied powder coating – which can be available on iron, aluminum, and steel – is definitely an especially durable kind of painted finish. The application form process builds a coating with very consistent coverage. During coating, any bare metal is likely to attract the powder, eliminating pinholes in coverage. The baking method that completes the finish gives it additional toughness and abuse resistance.
In applications where greater physical abuse is predictable, decorative bollards made of aluminum might be a better choice than iron. If the finish coat is damaged, aluminum oxidizes to your color that is generally more acceptable compared to red rust made by iron. Aluminum and stainless are also available in a variety of bare metal finishes. Functionality may be added to the otherwise decorative bollard. For example, common option is the chain eye – linking several bollards with chain, making a simple traffic direction system. A sizable metal loop or arm on the side in the post allows parking and locking of bicycles, an extremely popular choice as more people seek alternative green transportation. Bollards could also contain lighting units or security devices, like motion sensors or cameras.